The breach of the Nova Kakhovka dam is most worrying for what it says concerning the thoughts of Russian President Vladimir Putin and his generals - and their capability for harmful escalation.
It takes the battle in an much more perilous route.
The army influence is prone to be non permanent. Armies blow dams or use them to unleash floodwaters for tactical benefit.
The Soviets and the Germans each did it within the Second World War.
But the positive factors usually don't maintain. Water drains away, the bottom dries out.
Warning of 'grave penalties' after dam blast - reside updates
Ben Barry, a land battle senior fellow on the International Institute of Strategic Studies, mentioned: "It could set back any assault river crossing for a couple of weeks.
"Difficult to inform for a way lengthy. But solely as soon as the water subsides and the bottom dries out will Ukraine have the identical probability of a river crossing because it did earlier than the flood."
And he believes an assault throughout the swollen Dnipro shouldn't be out of the query even now.
"It's not impossible to do an assault river crossing across a river that's in full flood. It's just more difficult," he mentioned.
The Russians have blamed the Ukrainians for the assault, however most analysts have dismissed that as unlikely to not possible.
The Russians have a confirmed monitor file for accusing the opposite aspect of doing what they've themselves finished. And the Russians have most to realize. Up to some extent.
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The breach advantages the Russians by decreasing the size of the frontline it has to defend and permitting it to focus consideration within the east, however not indefinitely.
And it has blowback for the Russians too, flooding a few of the defensive positions they've dug in on the southern financial institution since retreating there final August.
So non permanent achieve, some self-harm and all of the opprobrium that comes with finishing up one more battle crime.
Where is the margin in that for Vladimir Putin? It seems rash and untimely. A disproportionate and irrational act.
But that could be the purpose.
Russian president 'excels in scare ways'
In battle, it could actually pay to do the loopy factor, to look unhinged and preserve your enemy guessing at your subsequent act of insanity.
Putin excels in scare ways and is aware of the dam blast makes him look extra harmful.
If Russia was irresponsible sufficient to blow the dam and unleash such destruction for restricted benefit, what is going to it do subsequent, planners in Kyiv and the West might be asking.
The worry now's for the Zaporizhzhia nuclear energy plant. The dam breach endangers the availability of water to its cooling programs. Could Russia now sabotage the plant to vary the course of the battle?
The destruction of the dam undoubtedly adjustments the chance calculus in dealing with Russia, however appropriately calibrating it should want cool heads so it's not overdone.
Putin has, in spite of everything, indulged in nuclear sabre-rattling for a lot of this battle.
It has weighed on the minds of Ukraine's allies and made them extra timid in arming Kyiv.
But up to now analysts say his nuclear bluster is simply that.
The nuclear choice
There isn't any signal of Putin beginning the prolonged technique of bringing tactical warheads out of storage and deploying them.
And any catastrophe at Zaporizhzhia threatens Russia most.
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The prevailing winds could be more than likely to hold the fallout east throughout the Russian border.
The Russians have proven gorgeous disregard for the welfare of their very own troopers however a radioactive cloud over their defensive positions and logistics strains could be difficult to say the least.
What we will say for certain is that this battle has swung once more in a extra unpredictable route and the longer it goes on, the extra such lurches are prone to occur.
Content Source: information.sky.com
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